KR101743215B1 - Autromatic switched neutral section system for locomotive - Google Patents

Autromatic switched neutral section system for locomotive Download PDF

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Publication number
KR101743215B1
KR101743215B1 KR1020150124104A KR20150124104A KR101743215B1 KR 101743215 B1 KR101743215 B1 KR 101743215B1 KR 1020150124104 A KR1020150124104 A KR 1020150124104A KR 20150124104 A KR20150124104 A KR 20150124104A KR 101743215 B1 KR101743215 B1 KR 101743215B1
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South Korea
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insulator
section
phase
insulation
automatic switching
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KR1020150124104A
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Korean (ko)
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KR20170027908A (en
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이방희
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(주)바이브록
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M5/00—Arrangements along running rails or at joints thereof for current conduction or insulation, e.g. safety devices for reducing earth currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00—Power supply lines for contact with collector on vehicle
    • B60M1/02—Details
    • B60M1/10—Arrangements for energising and de-energising power line sections using magnetic actuation by the passing vehicle

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The present invention relates to an automatic insulation section opening / closing apparatus for an electric vehicle, which is capable of automatically opening and closing an insulation section by a relatively simple structure safely and quickly without generating an arc.
The automatic insulated section opening and closing apparatus for an electric vehicle according to the present invention comprises a first section insulator having one end connected to a first phase transmission line and a switching runner disposed at the center thereof with air gaps at both ends, And one end connected to the insulator of the insulation section and the other end connected to the second phase line, and at the center, an air gap is formed at both ends of the insulation insulator section insulator, which is connected to the other end of the insulation section, And a first phase insulator interposed between the first section insulator and the insulator section for the insulation section, the input side being connected to the first phase catenary connected to one end of the first section insulator and the output side being connected to the first section insulator, A magnet coil coupled to the switching runner of the insulator, A first automatic switching unit for automatically opening and closing the first phase power at the time of traveling of the electric vehicle, and a second automatic switching unit interposed between the insulation section second insulator and the second section insulator, A magnetic coil having an input side connected to the second phase charge line connected to the other end of the two-section insulator and connected to a switching runner of the second section insulator at its output side, and a vacuum interrupter connected to one end of the second section insulator are connected in parallel And a second automatic switching unit that automatically opens and closes the second phase power at the time of running of the electric vehicle.

Figure R1020150124104

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic insulated switchgear for an electric vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulation section opening / closing device installed on a line of an electric vehicle, and more particularly, .

The electric cable is a special electric equipment that supplies electric power, which is the power source of electric vehicles. When connected to electricity having different phases due to its electrical characteristics, it is necessary to insulate the two electric sources so that they do not face each other. In this section, the electric vehicle travels with the inertia that it has progressed.

The insulation section is largely divided into the AC / DC insulation section and the AC / AC insulation section having a different phase. The AC / DC insulation section is installed in order to electrically distinguish between Seoul subway using DC system (DC 1,500V) and railway construction area using AC system (AC 25,000V) in Korea. The AC / AC insulation section is installed in front of the substation or between the substations to distinguish the electricity. When passing through the insulation section, the electric car must be driven by the force without the power. Therefore, it should be installed in the flat area or the estuary and the straight section as much as possible in order to facilitate the running operation.

In case of insulation section, separate the two power systems, but inserting no pressure line or FRP insulator in the middle to prevent breakdown or disconnection of current collector. If this section enters into a backward state, it will suddenly move from a non-pressurized state to a pressurized state, causing a spark, which may cause fire or equipment damage, and thus must pass in a non-return state.

For this reason, the front of the insulation section is preceded by an insulation section, and a reverse indicator is provided to indicate the point where the acceleration can be accelerated at a point completely deviating from the insulation section. However, since the accelerator position differs depending on the model of the vehicle, the marking for the electric locomotive and the electric motor vehicle is installed separately. In particular, for the electric vehicle, a separate mark is provided according to the knitting length. At present, information on these insulation sections is included in the train comprehensive control management device, and when it arrives at the corresponding point, the insulation section is automatically handled or notified.

On the other hand, at the time of passage of the insulation section, power supply is basically not performed, so that the lighting of the room or the air conditioner is shut off. To compensate this to some extent, the battery is installed in the vehicle body to maintain the power of the main device, or the power is supplied by regenerative power generation in the other run. However, in the case of the AC / AC insulation section, the insulation section is treated without switching off the service power supply, so that the switching is performed during the running of the vehicle.

An example of such an automatic insulation section opening / closing device is disclosed in Korean Patent Registration No. 10-1456531 (published on October 31, 2014), which is installed in a line before an insulation marking indicating an insulation section, And a controller for controlling the operation of the train in the insulated section by automatically calculating the distance of the insulated section, the distance of the vehicle, and the speed of the train by receiving information necessary for operating the train in the insulated section from the paper box An automatic control method for operating a railway insulation section including an on-board apparatus is provided.

In addition, Korean Patent Laid-Open Publication No. 10-2011-0116811 (published on October 26, 2011) discloses an apparatus for detecting a change in magnetic field when a high-speed train passes and an M- or T- A shut-off device for performing opening and closing operations through a switching device using a power semiconductor, a charge line connected to the shut-off device and supplying power to the high-speed train, And a control device for controlling the opening and closing operation of the shutoff device in accordance with the data type of the detected train detection signal.

However, in the conventional automatic insulated gate opening / closing apparatus as described above, since the insulated section is automatically opened and closed through a complicated control principle and a control device, there is a problem in that it is applied to an actual electric cable line.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide an automatic insulation section opening / closing apparatus that can open and close an insulation section with a relatively simple structure, Based on the task.

A first section insulator connected at one end to the first phase transmission line and having a switching runner at its center so as to form an air gap at both ends thereof and a second section insulator connected at one end to the other end of the first section insulator, And a second phase insulator which is interposed between the first section insulator and the insulator of the insulation section and is connected to the first phase charge line connected to one end of the first section insulator, A first automatic switching unit for automatically opening and closing the first phase power at the time of traveling of the electric vehicle, wherein a magnetic coil connected to the switching runner of the first section insulator and a vacuum interrupter connected to the other end of the first section insulator are connected in parallel, , Interposed between the insulation section insulator and the second section insulator A magnetic coil having an input side connected to the second phase circuit line connected to the other end of the second section insulator and connected to a switching runner of the second section insulator at its output side and a vacuum circuit breaker connected to one end of the second section insulator, And a second automatic switching unit for automatically opening and closing the second phase power at the time of traveling of the electric vehicle connected to the second automatic switching unit.

According to a preferred aspect of the present invention, the first and second section insulators include two rows of insulated wires which are arranged side by side and are grounded, and a plurality of insulated wires which are interposed between the two insulated wires so as to form the air gap at both ends, And an end support member to which both ends of the insulating wires in the two rows are coupled and are connected to and supported by the wire.

According to a preferred aspect of the present invention, the insulator section for the insulation section includes two rows of insulation wires which are arranged side by side and are grounded, and an end support member to which both ends of the insulation wires of the two rows are coupled and are fixed by a wire.

According to a preferred aspect of the present invention, the first and second automatic switching units are installed symmetrically with respect to the insulator section for the insulation section so that the insulation section can be automatically opened and closed regardless of the running direction.

According to a preferred feature of the present invention, the first and second automatic switching units are installed under the insulating insulator in a cantilever installed at the upper end of a strut for supporting a power supply line and a bundle.

According to the present invention, a first automatic switching unit including a magnetic coil and a vacuum circuit breaker is provided at an end of a first phase-transformer, and a magnetic coil and a vacuum Since the second automatic switching unit including the breaker is installed symmetrically to the first automatic switching unit, the opening and closing of the insulation section formed between the first and second automatic switching units can be performed safely and quickly There is an advantage that it can be done automatically.

1 is a side view showing the entire structure of an automatic insulation section opening and closing apparatus for an electric vehicle according to an embodiment of the present invention;
2 is a plan view showing the entire structure of an automatic insulation section opening and closing apparatus for an electric vehicle according to an embodiment of the present invention.
3 is a perspective view of a first and a second section insulator in an automatic insulation section opening and closing apparatus for an electric vehicle according to an embodiment of the present invention.
4 is a perspective view of a section insulator for an insulation section in an automatic insulation section opening / closing apparatus for an electric vehicle according to an embodiment of the present invention.
FIG. 5 is an installation view of the first and second automatic switching units in the automatic insulation section opening and closing apparatus for an electric vehicle according to the embodiment of the present invention. FIG.
6A to 6E are circuit diagrams illustrating an operation of an automatic insulation section opening / closing apparatus for an electric vehicle according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. , And this does not mean that the technical idea and scope of the present invention are limited.

1 to 6E, one end of the automatic insulated section opening / closing apparatus 1 for an electric vehicle according to the embodiment of the present invention is connected to the first phase transmission line 2 at one end and the switching runner 13 at the center, A first section insulator 10 installed at both ends so as to form an air gap, a section insulator 20 connected to the other end of the first section insulator 10 at one end and forming an insulation section, A second section insulator 30 connected to the insulator 20 for the insulation section and connected to the second phase transformer 3 at the other end and a switching runner 33 disposed at the center at both ends thereof, , The input side is connected to the first phase cadence line (2) interposed between the first section insulator (10) and the insulation section section insulator (20) and connected to one end of the first section insulator (10) The switching of the insulator 10 The magnetic coil 41 connected to the winder 13 and the vacuum interrupter 43 connected to the other end of the first section insulator 10 are connected in parallel to automatically transmit the first phase power during the passage of the electric vehicle 100 And a second phase charge line (3) interposed between the insulation section section insulator (20) and the second section insulator (30) and connected to the other end of the second section insulator (30) A magnetic coil 51 connected to the switching runner 33 of the second section insulator 30 and a vacuum breaker 53 connected to the other end of the second section insulator 30 are connected in parallel to the output side, And a second automatic switching unit (50) that automatically opens and closes the second phase power when the electric vehicle (100) passes.

Here, the first section insulator 10 is a component that is installed on a catenary path for electric power supply of the electric vehicle 100 and separately separates the first phase power from the second phase power.

One end of the first section insulator 10 is connected to the first phase transmission line 2 and a switching runner 13 is installed at the center of the first section insulator 10, And an air gap for enabling automatic opening and closing of the automatic switching unit 40 is formed.

As shown in Fig. 3, the first section insulator 10 includes two rows of insulating wires 11 that are arranged side by side and are grounded, and a pair of insulating wires 11 that are interposed between two rows of the insulating wires 11 so as to form air gaps at both ends A switching runner 13 and an end supporting member 15 to which both ends of the insulating wires 11 in two rows are coupled and are connected to and supported by the wire 4.

The insulating wire 11 is formed of an insulator such as wood or reinforced plastic (FRP).

A gap gap is formed at both ends of the switching runner 13 so that the first phase power supplied through the first phase transmission line 2 at the time of traveling of the electric vehicle is transmitted to the magnetic coils of the first automatic switching unit 40 So that the electric motor vehicle 100 is caused to run the part of the switching runner 13 without generating an arc and at this time the switching runner 13 is driven by the electric motor Thereby causing the vehicle 100 to be supplied with the first phase power.

The first section insulator 10 is the same as the conventional section insulator except for the switching runner 13 which is provided so as to form an air gap at both ends thereof, so that detailed description of the known constitution will be omitted for the sake of simplification of the description .

The section insulator 20 for the insulation section is connected to the other end of the first section insulator 10 described above so that the insulator 20 for the insulation section does not supply electric power to the electric vehicle 100, ) To constitute an insulation section which travels depending on the running inertia.

The section insulator 20 for the insulation section is composed of two rows of insulation wires 21 which are arranged side by side and which are grounded as shown in Fig. 4, two ends of the insulation wires 21 of two rows are connected and connected to the wire 4 And an end support member 25 which is supported.

The construction of the insulation section insulator 20 is already known, and a detailed description thereof will be omitted here for the sake of simplification of the description.

The second section insulator 30 is provided on the other end of the section insulator 20 for insulated section and the second section insulator 30 is installed on the electric wire line for electric power supply of the electric vehicle 100, Phase power to the first phase power.

One end of the second section insulator 30 is connected to the insulation section section insulator 20 and the other end of the second section insulator 30 is connected to the second phase transmission line 3 and a switching runner 33 is installed at the center A switching runner 13 is provided at the center of the first section insulator 10 so that an air gap is formed at both ends of the switching runner 33 to enable automatic opening and closing of the second automatic switching unit 50, Respectively.

As shown in Fig. 3, the second section insulator 30 includes two rows of insulating wires 31 arranged side by side and grounded, and two rows of insulating wires 31 so as to form air gaps at both ends A switching runner 33 and an end supporting member 35 to which both ends of the insulating wires 31 in two rows are coupled and are connected to and supported by the wire 4.

The insulated wire 31 is formed of an insulator such as wood or reinforced plastic (FRP).

A gap gap is formed at both ends of the switching runner 33 so that the second phase power supplied through the second phase line 3 at the time of traveling of the electric vehicle is transmitted to the magnetic coils of the second automatic switching unit 50 So that the electric motor vehicle 100 is caused to run on the part of the switching runner 33 without generating an arc and the switching runner 33 is driven by the electric motor Thereby causing the vehicle 100 to be supplied with the second phase power.

Since the second section insulator 20 is the same as the conventional section insulator except for the switching runner 23 provided so as to form an air gap at both ends, detailed description of the known constitution will be omitted for the sake of simplification of the description .

A first automatic switching unit 40 is interposed between the first section insulator 10 and the section insulator 20 for the insulation section and the first automatic switching unit 40 is disposed between the first section insulator 10 and the insulation section second insulator 20, And automatically opens and closes the first phase power without generating an arc when the section insulator 10 is driven.

The input side of the first automatic switching unit 40 is connected to the first phase transmission line 2 connected to one end of the first section insulator 10 and the output side of the first automatic switching unit 40 is connected to the first section insulator 10 And a vacuum interrupter 43 connected to the other end of the first section insulator 10 are connected in parallel to each other.

Since the magnetic coil 41 serves as a kind of inductor, arc generation is remarkably reduced at the time of a sudden voltage change, and the vacuum breaker 43 is maintained in the OFF state in which the contacts are disconnected at the normal time when the first phase power is applied The first phase power is automatically turned on and off when the first phase power is supplied to the electric vehicle 100 via the magnetic coil 41,

5, the first automatic switching unit 40 is connected to the cantilever 6 provided at the upper end of the column 5 for supporting the power supply line and the wire 4, And is fixed to the support 5 by a fixing bracket 8 provided at an end of the insulation insulator 7 at this time.

A second automatic switching unit 50 is interposed between the insulation section second insulator 20 and the second section insulator 30. The second automatic switching unit 50 is disposed between the second section insulator 30 and the second section insulator 30, And is a constituent member that automatically opens and closes the second phase power without generating an arc when the portion of the insulator 30 travels.

 The input side of the second automatic switching unit 50 is branch connected to the second phase charge line 3 connected to the other end of the second section insulator 30 and the output side of the second automatic switching unit 50 is connected to the second section insulator 30 And a vacuum interrupter 53 connected to the other end of the second section insulator 30 are connected in parallel with each other.

Since the magnetic coil 51 serves as a kind of inductor, arc generation is remarkably reduced at the time of a sudden voltage change, and the vacuum breaker 53 is maintained in the OFF state in which the contact is disconnected at the normal time when the second phase power is applied The second phase power is automatically turned on and off when the second phase power is supplied to the electric vehicle 100 via the magnetic coil 51,

5, the second automatic switching unit 50 includes a cantilever 6 installed at the upper end of a column 5 for supporting the power supply line and the wire 4, And is fixed to the support 5 by a fixing bracket 8 provided at an end of the insulation insulator 7 at this time.

Particularly, the first and second automatic switching units 40 and 50 are symmetrically arranged symmetrically with respect to the insulation section section insulator 20 so that the insulation section can be automatically opened and closed regardless of the running direction of the electric vehicle 100 It is preferable to install it.

6A to 6E, the overall operation of the automatic insulation section opening and closing apparatus 1 for an electric vehicle according to one embodiment of the present invention will be described as follows when the electric vehicle is driven in one direction:

6A, when the electric motor vehicle 100 receives and supplies the first phase electric power from the first phase transmission line 2, the magnetic coil 41 of the first automatic switching unit 40, No current flows through the magnetic coil 51 of the automatic switching unit 50 and the vacuum circuit breaker 43 of the first automatic switching unit 40 and the vacuum circuit breaker 53 of the second automatic switching unit 50 The contact is kept in the separated OFF state.

6B, the moment when the electric vehicle 100 travels through the air gap to the switching runner 13 portion of the first section insulator 10, the magnetic coil (not shown) of the first automatic switching unit 40 41 and simultaneously the contacts of the vacuum circuit breaker 43 of the first automatic switching unit 40 are brought into an ON state with each other being in contact with each other.

6C, the moment the electric motor vehicle 100 moves out of the switching runner 13 of the first section insulator 10 through the air gap and travels in the insulation section, the first automatic switching unit 40 The vacuum circuit breaker 43 of the first automatic switching unit 40 is maintained in the OFF state in which the contacts are disconnected from each other.

The vacuum circuit breaker 43 of the first automatic switching unit 40 and the vacuum circuit breaker 53 of the second automatic switching unit 50 are in the OFF state in which the contacts are disconnected from each other while the electric vehicle 100 is traveling in the insulation section The first phase power through the first phase line 2 and the second phase power through the second phase line 3 are completely separated and isolated from each other.

6D, the instant the electric motor vehicle 100 travels through the air gap to the portion of the switching runner 33 of the second section insulator 30, the magnetic coil (not shown) of the second automatic switching unit 50 51 and the vacuum circuit breaker 53 of the second automatic switching unit 50 are brought into the ON state while the contacts of the second automatic switching unit 50 are in contact with each other.

6E, the moment when the electric vehicle 100 moves away from the switching runner 33 portion of the first section insulator 30 through the air gap, the magnetic moment of the second automatic switching unit 50 No current flows through the coil 51 and the vacuum circuit breaker 53 of the second automatic switching unit 50 is kept in the OFF state in which the contacts are disconnected and as a result, the state shown in Fig. 6A is restored.

Since the first and second automatic switching units 40 and 50 are installed symmetrically with respect to each other with respect to the insulation section section insulator 20, even when the electric vehicle 100 travels in the reverse direction, the same opening operation as the above- . At this time, the second automatic switching unit 50 acts as the first automatic switching unit 40 and the first automatic switching unit 40 acts as the second automatic switching unit 50.

In the case of the automatic insulation section opening / closing apparatus 1 for an electric vehicle according to the embodiment of the present invention, the first automatic transmission section 1 including the magnetic coil 41 and the vacuum circuit breaker 43 at the end of the first phase- The second automatic switching unit 50 including the magnetic coil 51 and the vacuum circuit breaker 53 at the starting point of the second phase line 3 is installed in the first automatic switching unit 40 while the switching unit 40 is installed. The opening and closing of the insulation section formed between the first and second automatic switching units 40 and 50 can be performed safely and quickly automatically by a relatively simple structure regardless of the running direction of the electric vehicle There are advantages.

It is to be understood by those skilled in the art that the present invention may be embodied in many other forms without departing from the spirit and scope of the invention, It is therefore to be understood that the above-described embodiments are to be considered illustrative and not restrictive, and all embodiments falling within the scope of the appended claims and their equivalents are intended to be included within the scope of the present invention.

1: Automatic insulation section opening and closing device for electric vehicles
2: first phase electric line
3: second phase electric line
4:
5: holding
6: The cantilever
7: Insulation insulator
8: Retaining bracket
10: First section insulator
11: Insulated wire
13: Switching Runner
15: end support member
20: insulator for insulation section
21: insulated wire
25: end support member
30: Second section insulator
31: insulated wire
33: Switching runner
35: end support member
40: first automatic switching unit
41: Magnetic coil
43: Vacuum circuit breaker
50: second automatic switching unit
51: Magnetic coil
53: Vacuum circuit breaker

Claims (5)

A first section insulator connected at one end to the first phase transmission line and having a switching runner at its center so that air gaps are formed at both ends;
A section insulator for insulation section, one end of which is connected to the other end of the first section insulator and forms an insulation section;
A second section insulator having one end connected to the insulator of the insulation section and the other end connected to the second phase line, and a switching runner disposed at the center so as to form an air gap at both ends;
And an input side is connected to the first phase line connected to one end of the first section insulator and an output side is connected to a switching runner of the first section insulator, A first automatic switching unit which is connected in parallel with a coil and a vacuum breaker connected to the other end of the first section insulator so as to automatically open and close the first phase power at the time of running of the electric vehicle; And
A second phase insulator having a first phase insulator and a second phase insulator, wherein the second phase insulator includes a first phase insulator and a second phase insulator, And a second automatic switching unit for automatically opening and closing the second phase power at the time of traveling of the electric vehicle, wherein the coil and the vacuum interrupter connected to one end of the second section insulator are connected in parallel. The method according to claim 1,
Wherein the first and second section insulators comprise two rows of insulated wires arranged side by side and grounded, a switching runner interposed between the two rows of insulated wires so that the air gap is formed at both ends, And an end support member coupled to both ends of the first and second support members and coupled to the first and second support members. The method according to claim 1,
Wherein the insulator of the insulation section includes two rows of insulation wires which are arranged side by side and which are grounded and an end support member to which both ends of the insulation wires of the two rows are connected and which are held by a wire, Device. The method according to any one of claims 1 to 3,
Wherein the first and second automatic switching units are installed symmetrically with respect to the insulator section for the insulation section so as to automatically open and close the insulation section irrespective of the running direction. The method according to any one of claims 1 to 3,
Wherein the first and second automatic switching units are installed in a cantilever provided at an upper end of a strut for supporting a power supply line and a sidewall under an insulating insulator.
KR1020150124104A 2015-09-02 2015-09-02 Autromatic switched neutral section system for locomotive KR101743215B1 (en)

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KR1020150124104A KR101743215B1 (en) 2015-09-02 2015-09-02 Autromatic switched neutral section system for locomotive

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KR101743215B1 true KR101743215B1 (en) 2017-06-07

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KR200494296Y1 (en) * 2020-03-12 2021-09-08 이강섭 Disconnecting Switch of Electric Car Line

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003291694A (en) 2002-04-08 2003-10-15 Meidensha Corp Power supply facility for alternate current electric railroad
JP2007001560A (en) 2005-05-25 2007-01-11 Meidensha Corp Different power source switching equipment for alternating current electric railway
JP2009132363A (en) 2007-10-30 2009-06-18 Meidensha Corp Electric power supply switching system of intermediate sections for alternating current railroad
JP2009190641A (en) 2008-02-15 2009-08-27 Toshiba Corp Control method of switch in alternating-current electric railway
KR101456531B1 (en) 2013-07-24 2014-10-31 현대로템 주식회사 Automatic control method in insulated rail service interval

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003291694A (en) 2002-04-08 2003-10-15 Meidensha Corp Power supply facility for alternate current electric railroad
JP2007001560A (en) 2005-05-25 2007-01-11 Meidensha Corp Different power source switching equipment for alternating current electric railway
JP2009132363A (en) 2007-10-30 2009-06-18 Meidensha Corp Electric power supply switching system of intermediate sections for alternating current railroad
JP2009190641A (en) 2008-02-15 2009-08-27 Toshiba Corp Control method of switch in alternating-current electric railway
KR101456531B1 (en) 2013-07-24 2014-10-31 현대로템 주식회사 Automatic control method in insulated rail service interval

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